CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions		Total	Citigroup stockholders' equity	Preferred stock at aggregate liquidation value	Citigroup common stockholders' equity	Common stock and additional paid-in capital	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Retained earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock, at cost		Citigroup's accumulated other comprehensive income (loss)	Noncontrolling interests
Balance, beginning of period at Dec. 31, 2018				$ 18,460		$ 107,953	$ 151,347	$ 151		$ 151,498	$ (44,370)		$ (37,170)	$ 854
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,500
Redemption of preferred stock				(480)
Employee benefit plans						(201)					579	[2]
Preferred stock issuance costs						(4)
Common dividends	[3]						(3,299)
Preferred dividends		$ (812)					(812)
Other						24	(12)							(8)
Treasury stock acquired	[4]										(12,750)
Citigroup's total other comprehensive income (loss)													1,035	(26)
Transactions between noncontrolling-interest shareholders and the related consolidated subsidiary														(133)
Net income before attribution of noncontrolling interests		14,472					14,422							50
Distributions paid to noncontrolling-interest shareholders														(40)
Net change in noncontrolling interests														(157)
Balance, end of period at Sep. 30, 2019		197,070	$ 196,373	19,480	$ 176,893	107,772	161,797				(56,541)		(36,135)	697
Balance, beginning of period at Jun. 30, 2019				17,980		107,688	158,321			158,321	(51,427)		(35,203)	751
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,500
Employee benefit plans						69					6	[2]
Preferred stock issuance costs						(4)
Common dividends	[3]						(1,183)
Preferred dividends		(254)					(254)
Other						19								1
Treasury stock acquired	[4]										(5,120)
Citigroup's total other comprehensive income (loss)													(932)	(33)
Transactions between noncontrolling-interest shareholders and the related consolidated subsidiary														(34)
Net income before attribution of noncontrolling interests		4,928					4,913							15
Distributions paid to noncontrolling-interest shareholders														(3)
Net change in noncontrolling interests														(54)
Balance, end of period at Sep. 30, 2019		197,070	196,373	19,480	176,893	107,772	161,797				(56,541)		(36,135)	697
Balance, beginning of period at Dec. 31, 2019		193,946		17,980		107,871	165,369	$ (3,076)		162,293	(61,660)		(36,318)	704
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,500
Redemption of preferred stock				(1,500)
Employee benefit plans						(81)					448	[2]
Preferred stock issuance costs						2
Common dividends	[3]						(3,226)
Preferred dividends		(828)					(828)
Other						3	(4)							(2)
Treasury stock acquired	[4]										(2,925)
Citigroup's total other comprehensive income (loss)													3,253	7
Transactions between Citigroup and the noncontrolling-interest shareholders														(6)
Net income before attribution of noncontrolling interests		7,086					7,068							18
Distributions paid to noncontrolling-interest shareholders														(2)
Net change in noncontrolling interests														15
Balance, end of period at Sep. 30, 2020		194,595	193,876	17,980	175,896	107,795	165,303				(64,137)		(33,065)	719
Balance, beginning of period at Jun. 30, 2020				17,980		107,699	163,431			$ 163,431	(64,143)		(33,345)	680
Increase (Decrease) in Stockholders' Equity
Employee benefit plans						93					6	[2]
Common dividends	[3]						(1,074)
Preferred dividends		(284)					(284)
Other						3								(2)
Citigroup's total other comprehensive income (loss)													280	19
Net income before attribution of noncontrolling interests		3,254					3,230							24
Distributions paid to noncontrolling-interest shareholders														(2)
Net change in noncontrolling interests														39
Balance, end of period at Sep. 30, 2020		$ 194,595	$ 193,876	$ 17,980	$ 175,896	$ 107,795	$ 165,303				$ (64,137)		$ (33,065)	$ 719

[1] See Note 1 to the Consolidated Financial Statements for additional details.

[2] Includes treasury stock related to (i) certain activity on employee stock option program exercises where the employee delivers existing shares to cover the option exercise, or (ii) under Citi’s employee restricted or deferred stock programs where shares are withheld to satisfy tax requirements.

[3] Common dividends declared were $0.51 per share in the first, second and third quarters of 2020. Common dividends declared were $0.45 per share in the first and second quarters of 2019 and $0.51 per share in the third quarter of 2019.

[4] Primarily consists of open market purchases under Citi’s Board of Directors-approved common stock repurchase program.